export default class Notifier<T> {
    protected listenersVar: T[];
    readonly listeners: Iterable<T>;
    readonly listenerCount: number;
    listenerAdd(listener: T): T;
    listenerDel(listener: T): T;
    listenerDelAll(): void;
    protected post(notification: string, ...args: any[]): void;
    protected listeningStarted(): void;
    protected listeningStopped(): void;
}